How has technology like computers and the internet changed America?

Imagine a country that once mailed its letters by horse and waited weeks for an answer. That was America not so long ago. Then, over a single human lifetime, a machine the size of a room shrank into the phone in your pocket — and quietly rewired almost everything. Let's follow the change, one click at a time.
The first American computers were enormous. They filled whole rooms, hummed like refrigerators, and were used by the government and big companies for math and record-keeping. They weren't friendly. You couldn't ask them to play a song or show you a cat. They were powerful, expensive, and very, very far from your living room.
